[Xen-changelog] [xen staging] x86: use macro DIV_ROUND_UP

[patchbot@xxxxxxx]

commit 009360acc9c90513e4a85c7285d4fd7a665c66e1
Author:     Simran Singhal <singhalsimran0@xxxxxxxxx>
AuthorDate: Fri Apr 3 10:58:18 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Apr 3 10:58:18 2020 +0200

    x86: use macro DIV_ROUND_UP
    
    Use the DIV_ROUND_UP macro to replace open-coded divisor calculation
    (((n) + (d) - 1) / (d)) to improve readability.
    
    Signed-off-by: Simran Singhal <singhalsimran0@xxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/mm.c        | 2 +-
 xen/arch/x86/tboot.c     | 2 +-
 xen/arch/x86/x86_64/mm.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 2fac67ad57..fb53d62abc 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -240,7 +240,7 @@ static void __init init_frametable_chunk(void *start, void 
*end)
 void __init init_frametable(void)
 {
     unsigned int sidx, eidx, nidx;
-    unsigned int max_idx = (max_pdx + PDX_GROUP_COUNT - 1) / PDX_GROUP_COUNT;
+    unsigned int max_idx = DIV_ROUND_UP(max_pdx, PDX_GROUP_COUNT);
     struct page_info *end_pg, *top_pg;
 
     BUILD_BUG_ON(XEN_VIRT_END > FRAMETABLE_VIRT_START);
diff --git a/xen/arch/x86/tboot.c b/xen/arch/x86/tboot.c
index 102c3cd203..320e06f129 100644
--- a/xen/arch/x86/tboot.c
+++ b/xen/arch/x86/tboot.c
@@ -310,7 +310,7 @@ static void tboot_gen_frametable_integrity(const uint8_t 
key[TB_KEY_SIZE],
                                            vmac_t *mac)
 {
     unsigned int sidx, eidx, nidx;
-    unsigned int max_idx = (max_pdx + PDX_GROUP_COUNT - 1)/PDX_GROUP_COUNT;
+    unsigned int max_idx = DIV_ROUND_UP(max_pdx, PDX_GROUP_COUNT);
     uint8_t nonce[16] = {};
     vmac_ctx_t ctx;
 
diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index b7ce833ffc..cee836ec37 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -801,7 +801,7 @@ static int extend_frame_table(struct mem_hotadd_info *info)
     spfn = _mfn(info->spfn);
     epfn = _mfn(info->epfn);
 
-    eidx = (mfn_to_pdx(epfn) + PDX_GROUP_COUNT - 1) / PDX_GROUP_COUNT;
+    eidx = DIV_ROUND_UP(mfn_to_pdx(epfn), PDX_GROUP_COUNT);
     nidx = cidx = mfn_to_pdx(spfn)/PDX_GROUP_COUNT;
 
     ASSERT( mfn_to_pdx(epfn) <= (DIRECTMAP_SIZE >> PAGE_SHIFT) &&
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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